IL-17 induces NSCLC cell migration and invasion by elevating MMP19 gene transcription and expression through the interaction of p300-dependent STAT3-K631 acetylation and its Y705-phosphorylation

The cancer cell metastasis is a major death reason for patients with non-small cell lung cancer (NSCLC). Although researchers have disclosed that interleukin 17 (IL-17) can increase matrix metalloproteinases (MMPs) induction causing NSCLC cell metastasis, the underlying mechanism remains unclear. In the study, we found that IL-17 receptor A (IL-17RA), p300, p-STAT3, Ack-STAT3, and MMP19 were up-regulated both in NSCLC tissues and NSCLC cells stimulated with IL-17. p300, STAT3 and MMP19 overexpression or knockdown could raise or reduce IL-17-induced p-STAT3, Ack-STAT3 and MMP19 level as well as the cell migration and invasion. Mechanism investigation revealed that STAT3 and p300 bound to the same region (-544 to -389 nt) of MMP19 promoter, and p300 could acetylate STAT3-K631 elevating STAT3 transcriptional activity, p-STAT3 or MMP19 expression and the cell mobility exposed to IL-17. Meanwhile, p300-mediated STAT3-K631 acetylation and its Y705-phosphorylation could interact, synergistically facilitating MMP19 gene transcription and enhancing cell migration and invasion. Besides, the animal experiments exhibited that the nude mice inoculated with NSCLC cells by silencing p300, STAT3 or MMP19 gene plus IL-17 treatment, the nodule number, and MMP19, Ack-STAT3, or p-STAT3 production in the lung metastatic nodules were all alleviated. Collectively, these outcomes uncover that IL-17-triggered NSCLC metastasis involves up-regulating MMP19 expression via the interaction of STAT3-K631 acetylation by p300 and its Y705-phosphorylation, which provides a new mechanistic insight and potential strategy for NSCLC metastasis and therapy.

GAIT DIVISION OF HEALTHY AND SPINAL CORD–INJUREDRHESUS MONKEYSBY ONE-DIMENSIONAL TOE SIGNALS

Spinal cord injury (SCI) may cause disastrous damage to human locomotion and ultimately make patients suffer from gait anomaly. In the extensive SCI research, the locomotion function serves as a vital standard not only for revealing the underlying SCI mechanism but also for evaluating the clinical therapy. Gait division is the basis of gait analysis. Calculation of gait parameters is available for locomotion function evaluation only when gait cycles are accurately divided. Based on the characteristics of stride height, which is defined as the real-time height of toes vertical to the running direction of a treadmill belt, this study presented three automatic gait division methods, divided the gait cycles for healthy and spinal cord-injured rhesus monkeys, established the evaluation standards, and made comparison of these three methods. For the healthy, injured and mixed groups, the overall accuracies of these three methods were respectively 0.871[Formula: see text][Formula: see text][Formula: see text]0.223, 0.570[Formula: see text][Formula: see text][Formula: see text]0.372, and 0.720[Formula: see text][Formula: see text][Formula: see text]0.339 (method 1); 0.658[Formula: see text][Formula: see text][Formula: see text]0.245, 0.737[Formula: see text][Formula: see text][Formula: see text]0.206, and 0.698[Formula: see text][Formula: see text][Formula: see text]0.228 (method 2); 0.966[Formula: see text][Formula: see text][Formula: see text]0.060, 0.759[Formula: see text][Formula: see text][Formula: see text]0.343, and 0.863[Formula: see text][Formula: see text][Formula: see text]0.265 (method 3). The results show that the stride height characteristics combined with the filter technique may help realize the adequate gait division.

The effect of tissue culture on suture holding strength and degradation in canine tendon

The purpose of this study was to assess tendon metabolism and suture pull-out strength after simple tendon suture in a tissue culture model. One hundred and twelve flexor digitorum profundus tendons from 28 dogs were cultured for 7, 14, or 21 days with or without a static tensile load. In both groups increased levels of matrix metalloproteinase (MMP) mRNA was noted. Suture pull-out strength did not decrease during tissue culture. While the presence of a static load had no effect on the pull-out strength, it did affect MMP mRNA expression. This tissue culture model could be useful in studying the effect of factors on the tendon-suture interface.